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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...

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Probe-based Real-time PCR Approaches for Quantitative Measurement of microRNAs

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Published on: April 14, 2015

Specific GPCRs Elicit Unique Extracellular Vesicle MiRNA Array Signatures: An Exploratory Study.

Xiao Shi¹, Michelle C Palumbo², Sheila Benware¹

¹Research Service, Veterans Affairs Portland Health Care System, Portland OR 97239.

Biorxiv : the Preprint Server for Biology

|July 16, 2025

Summary

Stimulating G protein-coupled receptors (GPCRs) alters extracellular vesicle (EV) microRNA (miRNA) signatures without changing EV quantity. This reveals novel intercellular communication pathways for cell function and disease.

Keywords:

G protein-coupled receptor U2OS extracellular vesicle miRNA receptor signaling

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Area of Science:

Cell Biology
Molecular Biology
Pharmacology

Background:

Cells release extracellular vesicles (EVs) containing microRNAs (miRNAs) that mediate intercellular communication.
G protein-coupled receptors (GPCRs) are crucial signaling molecules, but their role in EV miRNA-mediated intercellular signaling is unclear.

Purpose of the Study:

To investigate if GPCR stimulation alters EV miRNA cargo.
To determine if specific GPCR signaling pathways lead to distinct EV miRNA signatures.
To explore the potential of EV miRNA signatures as biomarkers for GPCR-mediated cellular responses.

Main Methods:

Human U2 osteosarcoma cells expressing native GPCRs were stimulated with receptor-specific agonists.
EVs were isolated and characterized for quantity and size.
EV miRNA content was analyzed using next-generation sequencing.
Bioinformatic network analyses were performed to link miRNA changes to cellular functions.

Main Results:

GPCR stimulation did not alter the quantity of EVs released.
Distinct EV miRNA signatures were observed following stimulation of specific GPCRs and their associated signaling pathways (Gαi, Gαq, Gα12/13, β-arrestin).
Network analysis confirmed the link between specific receptors, altered EV miRNAs, and downstream cellular functions or pathological states.

Conclusions:

GPCRs modulate EV miRNA content, establishing a novel mechanism for intercellular communication.
EV miRNA signatures represent a potential readout for GPCR activity and downstream cellular effects.
Understanding these mechanisms can inform therapeutic strategies targeting GPCRs and their associated EV-mediated signaling.